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July 31, 2014

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Adrianne Haslet-Davis performs onstage with Christian Lightner at the 2014 TED Conference on Wednesday, March 19, 2014, in Vancouver, B.C.

James Duncan Davidson / 2014 TED Conference / AP

Adrianne Haslet-Davis performs onstage with Christian Lightner at the 2014 TED Conference on Wednesday, March 19, 2014, in Vancouver, B.C.